My program doesn't compile

#include <stdio.h>
#include <math.h>
#include <cs50.h>

int main (void);

{
int x=0;

x=GetInt();

for (x<10)
{
    printf("Hellon");
    i++;
}
return 0;

}

It says an error:

expected identifier or '('.

It seems to not allow me to compile. I'm probably doing an error.